This is the Congressional Budget Office Cost Estimate as ordered reported by the House Committee on Transportation and Infrastructure on March 24, 2021. From the Document: "Under current law, states are required to report to the Environmental Protection Agency (EPA) on nonpoint sources of pollution that affect navigable water as well as their plans to manage that pollution and improve the quality of navigable water. EPA provides grants for states to manage pollution from nonpoint sources and for other activities to protect groundwater quality. In 2021, $177 million was appropriated for those purposes. H.R. 2008 would authorize the appropriation of $200 million annually over the 2022-2026 period for those grant programs. Assuming appropriation of the specified amounts, CBO [Congressional Budget Office] estimates that implementing the bill would cost $740 million over the 2022-2026 period and $260 million after 2026. The costs of the legislation, detailed in Table 1, fall within budget function 300 (natural resources and environment)."
Congressional Budget Office: http://www.cbo.gov/